OFDM based systems - reducing undesired radiation

Hello everyone,

I am implementing a cognitive communication system inspired by
GNURadio’s OFDM implementation and some custom designed spectrum sensing
and management, medium access control, etc.

In order to address OFDM’s undesired radiation issues, I am
experimenting a technique reviewed in this nice post written by Tom
Rondeau
(http://www.trondeau.com/blog/2014/4/23/peer-review-of-a-dyspan-paper.html),
but I’m having problems combining multiple IIR filters in series
(eventually because of the resulting phase distortion).

There are several techniques that can be found in the literature to
address this issue, but I found this approach very interesting because
of its simplicity. Eventually, my future goal is to implement some
active cancellation sub-carrier style approach to mitigate non-contiguos
radiation.

I wonder how is the community addressing OFDM’s undesired radiation
issues (non contiguous and out of the band).

Best regards,

Germano

I’m also working on OFDM thing, but got little progress now.

Do you know how to start from existed OFDM code?

THX!

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